Case for a watch



FIG. 1 is a front elevational view of a case for a watch showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a top plan view thereof, the bottom being the same in appearance as the top; and

FIG. 4 is a right side elevational view thereof, the left side being a mirror image thereof.

The casing is shaded for transparency. 

The ornamental design for a case for a watch, as shown and described. 